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Pisidium Reticulatum
''Pisidium'' is a genus of very small or minute freshwater clams known as pill clams or pea clams, aquatic bivalve molluscs in the family Sphaeriidae, the pea clams and fingernail clams. In some bivalve classification systems, the family Sphaeriidae is referred to as Pisidiidae, and occasionally ''Pisidium'' species are grouped in a subfamily known as Pisidiinae. ''Pisidium'' and taphonomy In large enough quantities, the minute shells of these bivalves can affect environmental conditions, and this change in conditions can positively affect the ability of organic remains in the immediate environment to fossilize (one aspect of taphonomy). For example, in the Dinosaur Park Formation, the fossil remains of hadrosaur eggshells are rare. This is because the breakdown of tannins from the local coniferous vegetation caused the ancient waters to be acidic, and therefore usually eggshell fragments dissolved in the water before they had a chance to be fossilized. Hadrosaur eggshe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valve (mollusc)
A valve is each articulating part of the shell of a mollusc or another multi-shelled animal such as brachiopods and some crustaceans. Each part is known as a valve or in the case of chitons, a "plate". Members of two classes of molluscs, the Bivalvia (clams) and the Polyplacophora (chitons), have valves. Species within one family of very unusual small sea snails, marine opisthobranch gastropods in the family Juliidae, also have two articulating shells or valves, which resemble those of a bivalve. This exceptional family is commonly known as the bivalved gastropods. Gastropods in general are sometimes called "univalves", because in those that have a shell, the shell is usually in one part. Chitons The valves of chitons are eight dorsal, articulated shell plates, which are frequently coloured and sculpted. After death the girdle that holds the plates together disintegrates and the plates separate. Thus individual plates can be found washed up in beach drift, as shown in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Waldeni
''Euglesa waldeni'' is a species of mollusc belonging to the family Sphaeriidae. It is native to Northern Europe. Synonym: * ''Pisidium waldeni'' Kuiper, 1975 (= basionym In the scientific name of organisms, basionym or basyonym means the original name on which a new name is based; the author citation of the new name should include the authors of the basionym in parentheses. The term "basionym" is used in both botan ...) References {{Taxonbar, from=Q101438586 Sphaeriidae Molluscs described in 1975 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Supinum
''Pisidium supinum'' is a species of minute freshwater clam, a pea clam, an aquatic bivalve mollusc in the family Sphaeriidae (the fingernail clams and pea clams.) The shell of this species is 3 to 5 mm in size, and is roughly triangular in shape. Distribution Its native distribution is Palearctic. * Czech Republic – in Bohemia, in Moravia, Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF vulnerable (VU) * Germany – endangered (''gefährdet'') * Nordic countries: Denmark, Finland (endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as hab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Lilljeborgii
''Pisidium lilljeborgii'' is a species of freshwater bivalve from the family Sphaeriidae. Description A moderately swollen (tumid), trapezoidal shell. The umbos are just behind the mid point and described as fairly narrow. The surface (periostracum) is slightly glossy and has coarse, irregular concentric striae. The colour is grey to brownish white. Pisidium lilljeborgii has a less equilateral shape than ''Pisidium hibernicum'' 3-4.5mm. Distribution and conservation status * Not listed in IUCN red list – not evaluated (NE) * Germany – high endangered (''Stark gefährdet'') * Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden *Great Britain and IrelandRoy Anderson ,2005 An annotated list of the non-marine molluscs of Britain and Ireland Journal of Conchology, 38 (6): 607–637, (published 2005 References External links''Pisidium lilljeborgii''at Animalbase AnimalBase is a project brought to life in 2004 and is maintained by the University of Göttingen, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Henslowanum
''Pisidium henslowanum'' is a species of very small freshwater clam or pea clam, an aquatic bivalve mollusc in the family Sphaeriidae. It is commonly referred to as the Henslow peaclam. Etymology The specific name honours John Stevens Henslow. Description The shell is obliquely oval. It has prominent, narrow umbos well behind the middle and the umbos have oblique raised crests. The surface (periostracum) is silky with fine, even concentric striae. The colour is greyish, especially at the umbos. Widespread but local and uncommon. The size is 3.5-5mm. Distribution Its native distribution is Holarctic. * Czech Republic – in Bohemia, in Moravia, Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF least concern (LC) * Slovak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamarck
Jean-Baptiste Pierre Antoine de Monet, chevalier de Lamarck (1 August 1744 – 18 December 1829), often known simply as Lamarck (; ), was a French naturalist, biologist, academic, and soldier. He was an early proponent of the idea that biological evolution occurred and proceeded in accordance with natural laws. Lamarck fought in the Seven Years' War against Prussia, and was awarded a commission for bravery on the battlefield. Posted to Monaco, Lamarck became interested in natural history and resolved to study medicine. Packard (1901), p. 15. He retired from the army after being injured in 1766, and returned to his medical studies. Lamarck developed a particular interest in botany, and later, after he published the three-volume work ''Flore françoise'' (1778), he gained membership of the French Academy of Sciences in 1779. Lamarck became involved in the Jardin des Plantes and was appointed to the Chair of Botany in 1788. When the French National Assembly founded the Muséum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Obtusale
''Pisidium obtusale'' is a species of freshwater bivalve from family Sphaeriidae. Description The 2.5–3.5mm. shell is very tumid (swollen). It is an angular-oval shape with broad, rounded umbos which are behind the midpoint. The surface (periostracum) is glossy with fine concentric striae. Numerous pores are visible inside the shell. The colour is whitish to yellowish often coated with a red-brown deposit. Distribution Its native distribution is Holarctic. * Czech Republic – in Bohemia, in Moravia, Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF near threatened (NT) * Germany – (''Arten der Vorwarnliste'') * Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden *Great Britain and IrelandRoy Anderson ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Hinzi
''Euglesa hinzi'' is a species of mollusc belonging to the family Sphaeriidae. It is native to Northern Europe. Synonym: * ''Pisidium hinzi'' Kuiper, 1975 (= basionym In the scientific name of organisms, basionym or basyonym means the original name on which a new name is based; the author citation of the new name should include the authors of the basionym in parentheses. The term "basionym" is used in both botan ...) References {{Taxonbar, from=Q101438551 Sphaeriidae Molluscs described in 1975 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Dilatatum
''Pisidium dilatatum'' is a species of freshwater bivalve belonging to the family Sphaeriidae Sphaeriidae is a family of small to minute freshwater bivalve molluscs in the order Sphaeriida. In the US, they are commonly known as pea clams or fingernail clams. Heard, William H. 1977. Reproduction of fingernail clams (Sphaeriidae: ''Sphae .... It is widespread in Europe and Asia, from southern Sweden in the west to Lake Baikal in the east. It occurs in oligotrophic lakes. References Sphaeriidae Molluscs of Asia Molluscs of Europe Freshwater animals of Asia Freshwater animals of Europe Molluscs described in 1897 {{bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Amnicum
''Pisidium amnicum'' is a species of very small freshwater clam, sometimes known as the greater European peaclam or the River pea shell. It is an aquatic bivalve in the family Sphaeriidae. Description Although only 9 mm (range 7–11 mm) in length, this species is considerably larger than most ''Pisidium'' species, and has a fairly thick, concentrically ridged shell. Its shell is solid, glossy, triangular-oval in shape, and has broad but not prominent umbos often coated with a dull ferruginous deposit. Its colour is grey-white to brown, often with a greenish cast. Distribution Its native distribution is Palearctic. The species has been introduced to northeastern North America. * Czech Republic – endangered (EN), endangered in Bohemia (EN), critically endangered in Moravia Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. nnotated list of mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Personatum
''Pisidium personatum'' is a species of freshwater bivalve from the family Sphaeriidae. Description The 2.5-3.5 mm shell is a characteristic round-regular oval shape. It has centrally placed low, rounded umbos. The surface (periostracum) is dull or silky with very fine irregular concentric striations. The colour is yellowish to greyish but it is invariably coated in a red-brown to dark brown deposit. Distribution Its native distribution is European-Siberian. * Czech Republic – in Bohemia, in Moravia, Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF least concern (LC) * Germany – distributed in all of Germany but in 5 states in red list (''Rote Liste BRD''). * Nordic countries: Denmark, Faroes, Finland (near threat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
